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Washington, Apr 23: Air pollution over northern India has plummeted to a 20-year-low for this time of the year, according to satellite data published by US space agency National Aeronautics and Space Administration (NASA).
The US space agency's satellite sensors observed aerosol levels at a 20-year low post the countrywide lockdown, implemented to slow the spread of the novel coronavirus.

"We knew we would see changes in atmospheric composition in many places during the lockdown," said Pawan Gupta, a Universities Space Research Association (USRA) scientist at NASA''s Marshall Space Flight Center. "But I have never seen aerosol values so low in the Indo-Gangetic Plain at this time of year," added Mr Gupta.

Acting Assistant Secretary of State for South and Central Asia Alice G Wells tweeted, "These images from NASA were taken each spring starting in 2016 and show a 20-year low in airborne particle levels over India. When India and the world are ready to work and travel again, let's not forget that collaborative action can result in cleaner air."

The data published with maps show aerosol optical depth (AOD) in 2020 compared to the average for 2016-2019. Aerosol optical depth is a measure of how light is absorbed or reflected by airborne particles as it travels through the atmosphere.

If aerosols are concentrated near the surface, an optical depth of 1 or above indicates very hazy conditions. An optical depth, or thickness, of less than 0.1 over the entire atmospheric vertical column is considered "clean." The data were retrieved by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Terra satellite.

In the first few days of the lockdown, it was difficult to observe a change in the pollution signature. "We saw an aerosol decrease in the first week of the shutdown, but that was due to a combination of rain and the lockdown," said Mr Gupta.

Around March 27, heavy rain poured over vast areas of northern India and helped clear the air of aerosols. Aerosol concentrations usually increase again after such heavy precipitation.

"After the rainfall, I was really impressed that aerosol levels did not go up and return to normal. We saw a gradual decrease and things have been staying at the level we might expect without anthropogenic emissions," Mr Gupta said.

On March 25, the Indian government placed its 1.3 billion citizens under a strict lockdown to reduce the spread of COVID-19. The countrywide mandate decreased activity at factories and severely reduced car, bus, truck and airplane traffic. Every year, aerosols from anthropogenic (human-made) sources contribute to unhealthy levels of air pollution in many Indian cities.

Aerosols are tiny solid and liquid particles suspended in the air that reduce visibility and can damage the human lungs and heart.

In southern India though, the story is a little hazier. Satellite data show aerosol levels have not yet decreased to the same extent. In fact, levels seem to be slightly higher than in the past four years. The reasons are unclear but could be related to recent weather patterns, agricultural fires, winds or other factors.

"This a model scientific experiment," Robert Levy, program leader for NASA's MODIS aerosol products, said about the lockdown and its effects on pollution.

"We have a unique opportunity to learn how the atmosphere reacts to sharp and sudden reductions in emissions from certain sectors. This can help us separate how natural and human sources of aerosols affect the atmosphere," Mr Levy added.

Chennai/New Delhi, Jan 14: India's annual electricity demand in 2019 grew at its slowest pace in six years with December marking a fifth straight month of decline, government data showed, amid a broader economic slowdown that led to a drop in sales of everything from cars to cookies and also to factories cutting jobs.

Electricity demand is seen as an important indicator of industrial output in the country and a sustained decline could mean a further slowdown in the economy.

India's power demand grew at 1.1% in 2019, data from the Central Electricity Authority showed, the slowest pace of growth since a 1% uptick seen in 2013. The power demand growth slowdown in 2013 was preceded by three strong years of consumption growth of 8% or more.

In December, the country's power demand fell 0.5% from the year-earlier period, representing the fifth straight month of decline, compared with a 4.3% fall in November.

But in India's western states of Maharashtra and Gujarat, two of India's most industrialised provinces, monthly demand increased.

In October, power demand had fallen 13.2% from a year earlier, its steepest monthly decline in more than 12 years, as a slowdown in Asia's third-largest economy deepened.

Industry accounts for more than two-fifths of India's annual electricity consumption, while homes account for nearly a fourth and agriculture more than a sixth.

The slower demand growth is a blow for many debt-laden power producers, who are facing financial stress and are owed over $11 billion by state-run distribution companies.

India's overall economic growth slowed to 4.5% in the July-September quarter, government data released in November showed, the weakest pace since 2013 as consumer demand and private investment fell.

The government has estimated growth in the current financial year that runs through to March will be the slowest since the 2008 global crisis.

"This reflects overall economic slowdown, because if you look at other high frequency data like diesel consumption, everywhere you are seeing contraction," Rupa Rege Nitsure, chief economist at L&T Financial Holdings.

But India's central bank will not have much scope to cut rates to stimulate the economy because inflation has been rising sharply and reached 7.35% in December compared with 1.97% in January last year.

Economists say India's growth will continue to hover around 4.5% levels in the Oct-Dec quarter.

"In the Oct-Dec quarter as well growth (GDP) will be around the same level as July-September. My estimate for the full year is around 4.7% growth," Nitsure said.

Thiruvananthapuram, Mar 23: Amid a spurt in coronavirus cases, Kerala chief minister Pinarayi Vijayan has asked the Centre to give the states authority to give clearances for manufacturing masks, gloves and sanitisers.

In a letter addressed to prime minister Narendra Modi, Vijayan said during the crisis, masks and sanitisers are needed in large numbers.

"As an interim, states must be given authority to give clearances of manufacturing of items related to medical devices, sanitisers, chemicals, etc. which are needed for fighting Covid-19," Vijayan said in the letter.

He also sought permission for the state home department to use drones for the relevant applications related to Covid-19.

"In China and elsewhere in the world, drones have been used extensively in minimising human contact, disinfection, etc. Unfortunately, with the current laws pertaining to the use of drones, none of these is possible in India," the chief minister said.

He also sought permission to access and use facilities available with all central institutions and research labs operating in the state.

The chief minister shared the letter on his Twitter handle.

With 15 new positive cases of Covid-19, the total number of infected persons in Kerala had gone up to 67, including the three who were discharged after recovery last month.